CN105481092A - Sewage treatment device achieving automatic control function by monitoring N2O and control method - Google Patents
Sewage treatment device achieving automatic control function by monitoring N2O and control method Download PDFInfo
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- CN105481092A CN105481092A CN201610011739.1A CN201610011739A CN105481092A CN 105481092 A CN105481092 A CN 105481092A CN 201610011739 A CN201610011739 A CN 201610011739A CN 105481092 A CN105481092 A CN 105481092A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/34—N2O
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a sewage treatment device achieving the automatic control function by monitoring N2O and a control method. An anoxic treatment pond and an aerobiotic treatment pond are communicated through an internal reflux circulating pump and a pipeline, the bottom of the anoxic treatment pond is connected with a sodium acetate solution storage tank through a pipeline and a sodium acetate solution transmission pump, an anaerobic treatment pond and a sludge setting pond are communicated through an external reflux circulating pump and a pipeline, and an anoxic treatment pond N2O detection probe and an aerobiotic treatment pond N2O detection probe are arranged in the anoxic treatment pond and the aerobiotic treatment pond respectively. Automatic fast adjustment in the sewage treatment process is achieved by directly monitoring concentration changes of N2O, N2O generation is reduced substantially while the sewage treatment efficiency is improved, and the sewage treatment device is of great significance in achieving efficient automatic control and energy saving and emission reduction in the sewage treatment field.
Description
Technical field
The invention belongs to Wastewater Treated by Activated Sludge Process system automatic control technology field, be specifically related to a kind of by monitoring N
2the waste disposal plant that O controls automatically and control method.
Background technology
Along with developing rapidly and social progress of economy, the sanitary sewage produced in human lives and Industrial processes increases year by year, cause a series of serious environmental problems such as body eutrophication, living environment and the quality of life of people have been arrived in serious threat, therefore, higher requirement be there has also been for sewage disposal.Optimize wastewater treatment efficiency key to be to realize for the accurate control of sewage treatment process and quick adjustment, the change in process caused for variation water quality can rapid reaction, takes corresponding regulation measure, finally reaches the object improving outlet effect.And at present sewage work generally adopts is to Pollutant levels time sampling, to the method for the indirect water-quality guideline on-line monitoring such as dissolved oxygen and pH value, cannot to the quick response for the treatment of processes change, the response lag to water quality and process variation certainly will be caused like this, can not make in the fastest time and optimizing and revising.
It is found that in the further investigation of sewage treatment process, a kind of strong greenhouse gas N in biological denitrification process, can be produced
2o, it is respectively CO to global warming potential
2and CH
4200-300 doubly and 4-21 doubly, while N
2o is also considered to 21 century to one of the most serious threat of ozonosphere.Correlative study shows, the nitrification and denitrification process of sewage treatment process all has N
2o produces, and N
2the generation of O and wastewater treatment efficiency have significant dependency (KampschreurMJetal.Nitrousoxideemissionduringwastewatertr eatment.Waterresearch.2009,43 (17): 4093-4103).N
2o results from biological denitrification process, and its generation is that Nitrogen removal effect is the most directly reacted, and compared to dissolved oxygen and the pH value of water body, directly can react more rapidly the state of sewage treatment process; And when sewage treatment process operational excellence, N
2o generation is lower, when sewage treatment process occurs abnormal, and N
2o generation can increase rapidly.Therefore, by monitoring N
2the change of O concentration can the fluctuation situation of rapid reaction sewage treatment process, and then realizes the fine adjustment to sewage treatment process, reaches simultaneously and reduces greenhouse gases N
2the object that O produces is a kind of sewage monitoring autocontrol method having huge applications and be worth, but, do not have the relevant report of this aspect at present.
Summary of the invention
The technical problem that the present invention solves there is provided a kind of by monitoring N
2the waste disposal plant that O controls automatically and control method, by directly monitoring N
2o change in concentration realizes the automatic quick adjustment of sewage treatment process, while raising sewage treating efficiency, significantly reduce N
2the generation of O, to sewage treatment area realize high-efficient automatic control and energy-saving and emission-reduction significant.
The present invention adopts following technical scheme for solving the problems of the technologies described above, a kind of by monitoring N
2the waste disposal plant that O controls automatically and control method, is characterized in that: described by monitoring N
2the waste disposal plant that O controls automatically comprises anaerobic treatment pool, anaerobic treatment pond, aerobic treatment pond and mudpan, wherein the water outlet of anaerobic treatment pool connects anaerobic treatment pond by anaerobic treatment pool water outlet, the water outlet in anaerobic treatment pond connects aerobic treating pond by anaerobic treatment pond water outlet, the water outlet in aerobic treatment pond connects mudpan by aerobic treatment pond water outlet, anaerobic treatment pool, sludge agitation device is equipped with in anaerobic treatment pond and mudpan, the bottom in aerobic treatment pond is provided with aeration tube, this aeration tube is connected with air pump by pipeline, be connected by internal reflux recycle pump and pipeline between anaerobic treatment pond and aerobic treating pond, for mud mixture in aerobic treatment pond is inputted in anaerobic treatment pond, the bottom in anaerobic treatment pond is connected with sodium acetate solution hold-up vessel by pipeline and sodium acetate solution transmission pump, be connected by external reflux recycle pump and pipeline between anaerobic treatment pool with mudpan, for the mud after precipitation in mudpan is inputted in anaerobic treatment pool, to maintain the sludge concentration in Sewage treatment systems, anaerobic treatment pond N is respectively equipped with in anaerobic treatment pond and aerobic treating pond
2o detection probe and aerobic treating pond N
2o detection probe, anaerobic treatment pond N
2o detection probe, aerobic treatment pond N
2o detection probe, air pump, sodium acetate solution transmission pump, internal reflux recycle pump are connected with PLC computer automatic control system respectively by wire with external reflux recycle pump, described by monitoring N
2the concrete control process of the waste disposal plant that O controls automatically is: (1) treatment sewage enters anaerobic treatment pool by the water-in on anaerobic treatment pool top, in anaerobic treatment pool, mud suspended state is equably kept under the stirring action of muddy water agitator, the rotating speed of muddy water agitator remains on 300-500r/min, the hydraulic detention time of sewage in anaerobic treatment pool is 1-2h, and dissolved oxygen concentration remains on below 0.2mg/L, (2) sewage processed in anaerobic treatment pool enters anaerobic treatment pond by anaerobic treatment pool water outlet, sewage and mud keep mud suspended state equably under the stirring action of muddy water agitator in anaerobic treatment pond, the rotating speed of muddy water agitator remains on 300-500r/min, the hydraulic detention time of sewage in anaerobic treatment pond is 2-3h, dissolved oxygen concentration remains on below 0.5mg/L, the anaerobic treatment pond N in anaerobic treatment pond
2o monitoring probe is to the N in anaerobic treatment pond
2o concentration is monitored, when monitoring the N in anaerobic treatment pond
2when O concentration is higher than 0.1mg/L, PLC computer automatic controlling system opens sodium acetate solution transmission pump, with the transfer rate of 0.2L/min, the sodium acetate solution that the volumetric molar concentration in sodium acetate solution hold-up vessel is 0.5mol/L is transferred to anaerobic treatment pond, supplement carbon source needed for denitrification in anaerobic treatment pond, promote that denitrification is carried out, thus reduce N while raising nitric efficiency
2o produces, sodium acetate solution transmission pump while sodium acetate solution carries out reacting to anaerobic treatment pond in transmission, anaerobic treatment pond N
2o monitoring probe is by N
2the monitoring data of O concentration feeds back to PLC computer automatic control system, when monitoring the N in anaerobic treatment pond
2when O concentration is lower than 0.1mg/L, PLC computer automatic controlling system closes sodium acetate solution transmission pump, (3) sewage processed in anaerobic treatment pond enters aerobic treatment pond by anaerobic treatment pond water outlet, mud mixture keeps uniform suspended state under the aeration effect of aeration tube, pollutent in sewage is degraded to carbonic acid gas and water by the effect of microorganism aerobic biological metabolism in aerobic treatment pond, the hydraulic detention time of sewage in aerobic treatment pond is 6-8h, dissolved oxygen in aerobic treatment pond remains on 2mg/L by aeration effect, when system is normally run, nitration reaction is there is in aerobic treatment in pond, be nitrate nitrogen by ammonium oxidation, the muddy water mixed solution containing nitrate nitrogen generated is delivered to anaerobic treatment pond by internal reflux recycle pump, in anaerobic treatment pond, carry out anti-nitration reaction realize biological denitrificaion, aerobic treatment pond N in aerobic treatment pond
2o monitoring probe is to the N in aerobic treatment pond
2o concentration is monitored, when monitoring the N in Aerobic Pond
2when O concentration is higher than 0.1mg/L, PLC computer automatic controlling system increases the aeration rate of air pump to original 2 times, to improve the dissolved oxygen concentration in aerobic treatment pond, and then reduces N while improving nitration reaction efficiency
2the generation of O, the aeration rate increasing air pump to while original 2 times, aerobic treatment pond N
2o monitoring probe is by N
2the monitoring data of O concentration feeds back to PLC computer automatic control system, when monitoring aerobic treatment pond N
2when O concentration is lower than 0.1mg/L, PLC computer automatic controlling system air pump returns to initial aeration rate, (4) sewage processed in aerobic treatment pond enters mudpan by aerobic treatment pond water outlet, sewage carries out being separated of mud and sewage by gravity settling effect in mudpan, the residence time of sewage in mudpan is 1-2h, sewage after mud-water separation flows into mudpan water outlet by overflow weir, thus discharge this waste disposal plant, a mud part after precipitation is by mudpan mud discharging mouth effluent sewerage treatment unit, another part is back to anaerobic treatment pool by external reflux recycle pump, to keep the sludge concentration of waste disposal plant entirety, the sludge concentration of this waste disposal plant remains on 2500-3500mg/L, sludge retention time is 10-15d.
The present invention has following beneficial effect:
1, by PLC computer automatic control system can realization response device run online regulation and control, without the need to manual operation;
2, system is directly to N
2o concentration is monitored, and regulates be swift in response to treating processes, and wastewater treatment efficiency promotes obviously, N
2o generation amount of decrease Be very effective;
3, the present invention can be widely used in various actual waste water treating processes, and the practical situation according to existing Sewage Plant carry out scrap build installation, simple, workable.
Accompanying drawing explanation
Fig. 1 is by monitoring N in the present invention
2the structural representation of the waste disposal plant that O controls automatically;
Fig. 2 is by monitoring N in the present invention
2the waste disposal plant anaerobic treatment pond control method figure that O controls automatically;
Fig. 3 is by monitoring N in the present invention
2the waste disposal plant aerobic treatment pond control method figure that O controls automatically.
In figure: 1-water-in, 2-muddy water agitator, 3-anaerobic treatment pool, 4-anaerobic treatment pond, 5-aerobic treatment pond, 6-aeration tube, 7-air pump, 8-internal reflux recycle pump, 9-external reflux recycle pump, 10-mudpan mud discharging mouth, 11-mudpan, 12-mudpan water outlet, 13-overflow weir, 14-aerobic treatment pond water outlet, 15-aerobic treatment pond N
2o monitoring probe, 16-anaerobic treatment pond water outlet, 17-anaerobic treatment pond N
2o monitoring probe, 18-anaerobic treatment pool water outlet, 19-PLC computer automatic control system, 20-sodium acetate solution hold-up vessel, 21-sodium acetate solution transmission pump.
Embodiment
Be described in further details foregoing of the present invention by the following examples, but this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on foregoing of the present invention all belong to scope of the present invention.
As shown in Figure 1, a kind of by monitoring N
2the waste disposal plant that O controls automatically, is provided with anaerobic treatment pool 3, anaerobic treatment pond 4, aerobic treatment pond 5 and mudpan 11.Concrete mode of connection is: anaerobic treatment pool 3 water outlet enters anaerobic treatment pond 4 by anaerobic treatment pool water outlet 18, anaerobic treatment pond 4 water outlet enters aerobic treatment pond 5 by anaerobic treatment pond water outlet 16, and aerobic treatment pond 5 water outlet enters mudpan 11 by aerobic treatment pond water outlet 14.Anaerobic treatment pond 4 is connected by internal reflux recycle pump 8 with aerobic treating pond 5, and anaerobic treatment pool 3 is connected by external reflux recycle pump 9 with mudpan 11, and sodium acetate solution hold-up vessel 20 is connected with anaerobic treatment pond 4 by sodium acetate solution transmission pump 21.
Sewage water inlet in a device and flow pattern are: sewage enters anaerobic treatment pool 3 by anaerobic treatment pool water-in 1 from the top of anaerobic treatment pool 3, in anaerobic treatment pool 3, mud suspended state is equably kept under the stirring action of muddy water agitator 2, the rotating speed of muddy water agitator 2 remains on 300-500r/min, the hydraulic detention time of sewage in anaerobic treatment pool 3 is 1-2h, and dissolved oxygen concentration remains on below 0.2mg/L.In anaerobic treatment pool 3, the complicated organism in sewage is hydrolyzed acidifying, and change simple organic into, polyP bacteria under anaerobic releases phosphorus.The sewage processed in anaerobic treatment pool 3 enters anaerobic treatment pond 4 by anaerobic treatment pool water outlet 18, sewage and mud keep mud suspended state equably under the stirring action of muddy water agitator 2 in anaerobic treatment pond 4, the rotating speed of muddy water agitator 2 remains on 300-500r/min, the hydraulic detention time of sewage in anaerobic treatment pond 4 is 2-3h, and dissolved oxygen concentration remains on below 0.5mg/L.In anaerobic treatment pond 4, mainly carry out biological denitrificaion anti-nitration reaction, the nitrate being entered anoxic pond by internal recycle is removed by denitrification.Storing volumetric molar concentration in sodium acetate solution hold-up vessel 20 is that the sodium acetate solution of 0.5mol/L is as the supplementary carbon source in hypoxia response pond 4 during anti-nitration reaction exception, sodium acetate solution hold-up vessel 20 is connected with anaerobic treatment pond 4 by sodium acetate solution transmission pump 21, and sodium acetate solution transmission pump 21 and PLC computer automatic control system 19 pass through connection.The sewage processed in anaerobic treatment pond 4 enters aerobic treatment pond 5 by anaerobic treatment pond water outlet 16, mud mixture keeps uniform suspended state under the aeration effect of aeration tube 6, pollutent in sewage is degraded to carbonic acid gas and water by the effect of microorganism aerobic biological metabolism in aerobic treatment pond 5, the hydraulic detention time of sewage in aerobic treatment pond 5 is 6-8h, and the dissolved oxygen in aerobic treatment pond 5 remains on 2mg/L by aeration effect.The sewage processed in aerobic treatment pond 5 enters mudpan 11 by aerobic treatment pond water outlet 14, sewage carries out being separated of mud and sewage by gravity settling effect in mudpan 11, the residence time of sewage in mudpan 11 is 1-2h, sewage after mud-water separation flows into mudpan water outlet 12 by overflow weir 13, thus discharge this waste disposal plant, a mud part after precipitation is by mudpan mud discharging mouth 10 effluent sewerage treatment unit, output is according to sludge concentration, useful volume and the sludge retention time of waste disposal plant calculate, another part is back to anaerobic treatment pool 3 by external reflux recycle pump 9, to keep the sludge concentration of waste disposal plant entirety.The sludge concentration of this waste disposal plant remains on 2500-3500mg/L, and sludge retention time is 10-15d.For preventing forming block mud flco in active sludge precipitation process, and then formation turbulent state, make in returned sluge, only to have sewage and do not contain mud, affecting sludge reflux and discharge, be provided with muddy water agitator 2 in mudpan 11, the mixing speed of this muddy water agitator 2 is 20-40r/min.
Anaerobic treatment pond N is provided with in anaerobic treatment pond 4
2o monitoring probe 17, is used for monitoring the N produced in the reaction process of anaerobic treatment pond
2o, anaerobic treatment pond N
2the controller of O monitoring probe 17 is connected with computer by PLC computer automatic control system, anaerobic treatment pond 4 is connected with aerobic treatment pond 5 by internal reflux recycle pump 8, when device normally runs, nitration reaction is there is in aerobic treatment pond 5, be nitrate nitrogen by ammonium oxidation, the muddy water mixed solution containing nitrate nitrogen generated is delivered to anaerobic treatment pond 4 by internal reflux recycle pump 8, carries out anti-nitration reaction and realize biological denitrificaion in anaerobic treatment pond 4.Aerobic treatment pond N is provided with in aerobic treatment pond 5
2o monitoring probe 15, is used for monitoring the N produced in the reaction process of aerobic treatment pond 5
2o, aerobic treatment pond N
2the controller of O monitoring probe 15 is connected with computer by PLC computer automatic control system 19.PLC automatic control system 19 is connected with sodium acetate solution transmission pump 21 and air pump 7, according to the anaerobic treatment pond N in anaerobic treatment pond 4 and aerobic treating pond 5
2o monitoring probe 17 and aerobic treating pond N
2the N that O monitoring probe 15 feeds back
2o concentration controls the operation of sodium acetate solution transmission pump 21 and air pump 7.
By monitoring N in anaerobic treatment pond 4
2o controls the method for sewage treatment process.Anaerobic treatment pond is the functional unit that waste disposal plant carries out denitrification denitrogenation, N
2it is complete that the generation of O shows that denitrification process does not carry out, and supplementary carbon source effectively can promote the carrying out of anti-nitration reaction as electron donor, improves nitric efficiency.After operation of sewage disposal system opens anaerobic treatment pond Controlling System, the anaerobic treatment pond N in anaerobic treatment pond 4
2n in O monitoring probe 17 pairs of anaerobic treatment ponds 4
2o concentration is monitored, when monitoring the N in anaerobic treatment pond 4
2when O concentration is higher than 0.1mg/L, open sodium acetate solution transmission pump 21, with the transfer rate of 0.2L/min, the sodium acetate solution that the volumetric molar concentration in sodium acetate solution hold-up vessel 20 is 0.5mol/L is transferred to anaerobic treatment pond 4, supplement carbon source needed for denitrification in hypoxia response pond 4, promote that denitrification is carried out, thus reduce N while raising nitric efficiency
2o produces.Sodium acetate solution transmission pump 21 while sodium acetate solution carries out reacting to hypoxia response pond in transmission, anaerobic treatment pond N
2o monitoring probe 17 is by N
2the monitoring data of O concentration feeds back to PLC computer automatic control system 19, when monitoring N
2when O concentration is lower than 0.1mg/L, PLC computer automatic control system 19 closes sodium acetate solution transmission pump 21.
By monitoring N in aerobic treatment pond 5
2o controls the method for sewage treatment process.Aerobic treatment pond 5 is functional units that waste disposal plant carries out nitration reaction, N
2the generation of O shows that pollutant load is comparatively large in nitration reaction, needs the dissolved oxygen supply increased in reactive system.After operation of sewage disposal system opens aerobic treatment pond Controlling System, the aerobic treatment pond N in aerobic treatment pond 5
2o monitoring probe 15 starts the N in aerobic treatment pond 5
2o concentration is monitored, when monitoring the N in aerobic treatment pond 5
2when O concentration is higher than 0.1mg/L, the aeration rate being increased air pump 7 by PLC computer automatic control system 19, to original 2 times, to improve the dissolved oxygen concentration in aerobic treatment pond 5, and then reduces N while improving nitration reaction efficiency
2the generation of O.The aeration rate increasing air pump 7 to while original 2 times, aerobic treatment pond N
2o monitoring probe 15 is by N
2the monitoring data of O concentration feeds back to PLC computer automatic control system 19, when monitoring N
2when O concentration is lower than 0.1mg/L, PLC computer automatic control system 19 controls air pump 7 and returns to initial aeration rate.
Embodiment 1
The real life wastewater treatment process discharged for certain community, adopts by monitoring N
2the waste disposal plant that O controls automatically as shown in Figure 1, employing by monitoring N
2the sewage disposal working method that O controls automatically as Figure 2-3, selected waste disposal plant anaerobic treatment pool useful volume 10L, anaerobic treatment pond useful volume 18L, aerobic treatment pond useful volume 50L, mudpan useful volume 20L, wastewater influent water quality is: COD concentration 300-400mg/L, NH
4 +concentration 40-50mg/L, TN concentration 47-52mg/L, TP concentration 3-5mg/L, sewage load is 120L/d, reactor seed sludge adopts Sewage Plant aerobic treatment pond fresh activity mud, and in reactor, sludge concentration maintains 3000mg/L, and aerobic treatment pond aeration rate is constant in 200L/h, dissolved oxygen concentration maintains 2mg/L, and sludge age maintains 13d.
Open waste disposal plant, carry out sewage disposal in normal state, anaerobic treatment pond and aerobic treatment are by monitoring N
2before the concentration automatic control system unlatching of O, wastewater treatment efficiency is: COD clearance average 85%, NH
4 +average 80%, the TN clearance average 65%, N of clearance
2o generation is 60-80mg/d.
Unlatching anaerobic treatment pond and aerobic treating pond are by monitoring N
2the automatic control system of O.In anaerobic treatment pond, work as N
2when O concentration is greater than 0.1mg/L, PLC computer automatic controlling system opens sodium acetate solution transmission pump, with the speed of 0.2L/min, the sodium acetate solution that volumetric molar concentration is 0.5mol/L is transferred to anaerobic treatment pond, works as N
2when O concentration is less than 0.1mg/L, PLC computer automatic controlling system sodium acetate solution transmission pump is closed; In aerobic treatment pond, as monitoring N
2when O concentration is greater than 0.1mg/L, PLC computer automatic controlling system air pump increases the twice that aeration rate is former aeration rate, as monitoring N
2when O concentration is less than 0.1mg/L, PLC computer automatic controlling system air pump is returned to the aeration rate before raising.
By monitoring N
2after the automatic control system of O and working method are applied, wastewater treatment efficiency is: COD clearance average 90%, NH
4 +average 90%, the TN clearance average 80% of clearance, the treatment effect of principal pollutant is all significantly improved.N
2o generation, lower than 5mg/d, have dropped about 93%.While improving waste disposal plant processing efficiency, achieve N
2o generation declines to a great extent.
Embodiment above describes ultimate principle of the present invention, principal character and advantage; the technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; under the scope not departing from the principle of the invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the scope of protection of the invention.
Claims (1)
1. one kind is passed through monitoring N
2the waste disposal plant that O controls automatically and control method, is characterized in that: described by monitoring N
2the waste disposal plant that O controls automatically comprises anaerobic treatment pool, anaerobic treatment pond, aerobic treatment pond and mudpan, wherein the water outlet of anaerobic treatment pool connects anaerobic treatment pond by anaerobic treatment pool water outlet, the water outlet in anaerobic treatment pond connects aerobic treating pond by anaerobic treatment pond water outlet, the water outlet in aerobic treatment pond connects mudpan by aerobic treatment pond water outlet, anaerobic treatment pool, sludge agitation device is equipped with in anaerobic treatment pond and mudpan, the bottom in aerobic treatment pond is provided with aeration tube, this aeration tube is connected with air pump by pipeline, be connected by internal reflux recycle pump and pipeline between anaerobic treatment pond and aerobic treating pond, for mud mixture in aerobic treatment pond is inputted in anaerobic treatment pond, the bottom in anaerobic treatment pond is connected with sodium acetate solution hold-up vessel by pipeline and sodium acetate solution transmission pump, be connected by external reflux recycle pump and pipeline between anaerobic treatment pool with mudpan, for the mud after precipitation in mudpan is inputted in anaerobic treatment pool, to maintain the sludge concentration in Sewage treatment systems, anaerobic treatment pond N is respectively equipped with in anaerobic treatment pond and aerobic treating pond
2o detection probe and aerobic treating pond N
2o detection probe, anaerobic treatment pond N
2o detection probe, aerobic treatment pond N
2o detection probe, air pump, sodium acetate solution transmission pump, internal reflux recycle pump are connected with PLC computer automatic control system respectively by wire with external reflux recycle pump, described by monitoring N
2the concrete control process of the waste disposal plant that O controls automatically is: (1) treatment sewage enters anaerobic treatment pool by the water-in on anaerobic treatment pool top, in anaerobic treatment pool, mud suspended state is equably kept under the stirring action of muddy water agitator, the rotating speed of muddy water agitator remains on 300-500r/min, the hydraulic detention time of sewage in anaerobic treatment pool is 1-2h, and dissolved oxygen concentration remains on below 0.2mg/L, (2) sewage processed in anaerobic treatment pool enters anaerobic treatment pond by anaerobic treatment pool water outlet, sewage and mud keep mud suspended state equably under the stirring action of muddy water agitator in anaerobic treatment pond, the rotating speed of muddy water agitator remains on 300-500r/min, the hydraulic detention time of sewage in anaerobic treatment pond is 2-3h, dissolved oxygen concentration remains on below 0.5mg/L, the anaerobic treatment pond N in anaerobic treatment pond
2o monitoring probe is to the N in anaerobic treatment pond
2o concentration is monitored, when monitoring the N in anaerobic treatment pond
2when O concentration is higher than 0.1mg/L, PLC computer automatic controlling system opens sodium acetate solution transmission pump, with the transfer rate of 0.2L/min, the sodium acetate solution that the volumetric molar concentration in sodium acetate solution hold-up vessel is 0.5mol/L is transferred to anaerobic treatment pond, supplement carbon source needed for denitrification in anaerobic treatment pond, promote that denitrification is carried out, thus reduce N while raising nitric efficiency
2o produces, sodium acetate solution transmission pump while sodium acetate solution carries out reacting to anaerobic treatment pond in transmission, anaerobic treatment pond N
2o monitoring probe is by N
2the monitoring data of O concentration feeds back to PLC computer automatic control system, when monitoring the N in anaerobic treatment pond
2when O concentration is lower than 0.1mg/L, PLC computer automatic controlling system closes sodium acetate solution transmission pump, (3) sewage processed in anaerobic treatment pond enters aerobic treatment pond by anaerobic treatment pond water outlet, mud mixture keeps uniform suspended state under the aeration effect of aeration tube, pollutent in sewage is degraded to carbonic acid gas and water by the effect of microorganism aerobic biological metabolism in aerobic treatment pond, the hydraulic detention time of sewage in aerobic treatment pond is 6-8h, dissolved oxygen in aerobic treatment pond remains on 2mg/L by aeration effect, when system is normally run, nitration reaction is there is in aerobic treatment in pond, be nitrate nitrogen by ammonium oxidation, the muddy water mixed solution containing nitrate nitrogen generated is delivered to anaerobic treatment pond by internal reflux recycle pump, in anaerobic treatment pond, carry out anti-nitration reaction realize biological denitrificaion, aerobic treatment pond N in aerobic treatment pond
2o monitoring probe is to the N in aerobic treatment pond
2o concentration is monitored, when monitoring the N in Aerobic Pond
2when O concentration is higher than 0.1mg/L, PLC computer automatic controlling system increases the aeration rate of air pump to original 2 times, to improve the dissolved oxygen concentration in aerobic treatment pond, and then reduces N while improving nitration reaction efficiency
2the generation of O, the aeration rate increasing air pump to while original 2 times, aerobic treatment pond N
2o monitoring probe is by N
2the monitoring data of O concentration feeds back to PLC computer automatic control system, when monitoring aerobic treatment pond N
2when O concentration is lower than 0.1mg/L, PLC computer automatic controlling system air pump returns to initial aeration rate, (4) sewage processed in aerobic treatment pond enters mudpan by aerobic treatment pond water outlet, sewage carries out being separated of mud and sewage by gravity settling effect in mudpan, the residence time of sewage in mudpan is 1-2h, sewage after mud-water separation flows into mudpan water outlet by overflow weir, thus discharge this waste disposal plant, a mud part after precipitation is by mudpan mud discharging mouth effluent sewerage treatment unit, another part is back to anaerobic treatment pool by external reflux recycle pump, to keep the sludge concentration of waste disposal plant entirety, the sludge concentration of this waste disposal plant remains on 2500-3500mg/L, sludge retention time is 10-15d.
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| CN106007171A (en) * | 2016-05-20 | 2016-10-12 | 河南师范大学 | Integrated sludge reduction recycling and N2O emission reduction sewage treatment device and method for operating same |
| CN108675449A (en) * | 2018-05-03 | 2018-10-19 | 南京大学 | A kind of device and method of processing ammonia nitrogen waste water |
| CN109912133A (en) * | 2019-04-17 | 2019-06-21 | 扬州大学 | One kind realizing N by regulation dissolved oxygen2O decrement and processing unit |
| CN109912132A (en) * | 2019-04-17 | 2019-06-21 | 扬州大学 | A kind of regulation dissolved oxygen realization N2The real-time control apparatus and its application method of O decrement |
| CN110818197A (en) * | 2019-11-26 | 2020-02-21 | 胡维东 | Sewage treatment method and device for improving sewage treatment efficiency and sewage treatment controller |
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| CN108675449A (en) * | 2018-05-03 | 2018-10-19 | 南京大学 | A kind of device and method of processing ammonia nitrogen waste water |
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